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Acer M5201 Fan Speed Strange Annoyance

I have an Acer M5201 desktop which came with windows vista, I since put Windows 7 Ultimate 64 bit on. The problem I have is that when I start up the PC, the fan comes on very noisy at full speed and doesn't slow down at all, I seem to remember that it used to come on full speed for a few seconds and then slow down, however the strange thing is, if I put it to sleep, and then wake it up immediately (or at any time later) when it comes back on, the fan is slow and fairly quiet, and performs correctly, so it only speeds up if it gets hot and then slows down again.
The PC isn't getting overly hot causing the fan to remain on full as the sleep wake cycle makes it work correctly, I have checked the CPU and it is around the 47 mark. Any suggestions please?

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